package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid=getOpenId(userLoginDTO.getCode());
        //判断openid是否为空，如果为空代表登录失败，抛出业务异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
        LambdaQueryWrapper<User> lam=new LambdaQueryWrapper<>();
        lam.eq(User::getOpenid,openid);
        User user = userMapper.selectOne(lam);
        if(user==null){
           user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
           userMapper.insert(user);
        }
        return user;
    }

    /**
     * 调用微信服务获取微信用户的openId
     * @param code
     * @return
     */
    private String getOpenId(String code){
        //发送请求到微信服务端口获取用户唯一id
        Map<String,String> data=new HashMap<>();
        data.put("appid",weChatProperties.getAppid());
        data.put("secret",weChatProperties.getSecret());
        data.put("js_code",code);
        data.put("grant_type","authorization_code");
        String s = HttpClientUtil.doGet(WX_LOGIN, data);
        //解析json字符串
        JSONObject jsonObject = JSON.parseObject(s);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
